The column base region in reinforced concrete (RC) frames is considered a critical zone due to the concentration of stresses and the transfer of forces between the column and the foundation. In this study, the effect of strengthening the column base using HPFRCC sheets in two configurations, including L-shaped (L) and side plates (S), is investigated. To determine the mechanical properties of the strengthening material, HPFRCC specimens with different percentages of wollastonite powder replacing cement were prepared and tested under compressive, tensile, and flexural loading. Subsequently, an RC frame was modeled in ABAQUS, and after validating the numerical model, the influence of the strengthening configurations on the structural performance was evaluated. A parametric study was also conducted by varying the strengthening length coefficient α. The results show that both strengthening methods improve the lateral load-carrying capacity compared with the reference frame, which has a capacity of 111.478 kN. In the L-shaped configuration, the capacity increased from 143.58 kN to 165.07 kN for α=1 to α=2, corresponding to an improvement of approximately 29–48%. In contrast, the side configuration increased the capacity to a range of 118.93–121.66 kN, representing an increase of about 7–9%. The results indicate that the L-shaped configuration provides more effective structural performance due to the simultaneous engagement of the column and foundation and improved force transfer in the column base region